Hacksaw



No. 626,53I. Patented lune 6, |899. E. E. EUCHENHOFER.

HACKSAW.

(Application led Apr. 3, 1899.)

2 Sheets-Sheet l.

(No Model.)

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Patented lune 6, |899.

No. 626,53l.

E. E. EUCHENHUFER.

HACKSAW.

(Application led Apr. 3, 1899.)

2 Sheets-Sheet 2.

(No Model.)

h llllh lll mcg-wm m: Nowms Evans co. pHoro-mma, wwnm'o llNrrnn STATESPATENT OFFICE.

ED\VARD E. EUOHENHOFER, OF DAYTON, OIIIO.

HAC KSAW.

SPECIFICATION forming part of Letters Patent No. 626,531, dated J' une6, 1899.

Application filed April 3,1899. SerialNo. 711,470. (No model.)

To @ZZ whom 'it may concern:

Be it known that I, EDWARD E'. BUCHEN- HOFER, a citizen of the UnitedStates, residing at Dayton, in the county of Montgomery and State ofOhio, have invented certain new and useful Improvements in Hacksaws, ofwhich the following is a specification, reference being had therein tothe accompanying drawings.

This invention relates to certain new and useful improvements inhacksaws for sawing metal, tc.

The object of this invention is to provide means for forcing the hacksawinto the metal when the saw is making its cutting stroke and to raisesuch saw from engagement with the metal on its return stroke..

My invention also relates to improved means for automatically stoppingthe movement of the saw when the metal being operated upon has beensawed in two.

My invention further relates to a reci proeating saw-carriage and acombined pivoted saw-frame.

My invention also relates to details of construction hereinafterappearing, and particularly pointed out in t-he claims.

In the accompanying drawings, on which like reference letters andnumerals indicate corresponding parts, Figure l is a side elevation ofmy improved hacksaw complete; Fig. 2, a plan View of the same; Fig. 3, adetail partial sectional view showing the manner in which the saw-frameis connected with the sawcarriage, together with the frictional clutchfor operating the saw-carriage; Fig. 4, a partial detail sectional viewon the line no or of Fig. 3, looking in the direction of the arrows 5Fig. 5, a partial detail perspective View of the operating-lever forthrowing the machine into and out of gear; Fig. 6, a partial perspectiveview of the bearing-brackets and bearing for the main driving-shaft, andFig. 7 a detail view of the guide and guide-bolt to prevent thesaw-frame from having side movement.

I-Ieretofore in machines of this class it has been very difcult toobtain a perfectly smooth cut in the iron and also to prevent the sawfrom dragging as it made its return stroke. IVith my invention Ihaveprovided means for causing the saw-teeth to be forced into engagementwith the iron being operated upon, and at the same time the same meanswill cause the saw to be disengaged from such iron on the back ornon-cutting stroke.

The letter A represents a suitable base mounted upon legs B. This basecarries a driving-wheel C, mounted in suitable bearings D upon a shaftE. It will be seen that the hub G has a lug or extension II from itsouter face, which at certain times is adapted to engage with a lug I,extending from acollar J, fixed upon the shaft E. In order to cause thelugs I and .I to engage with each other, I provide a lever K, which ismounted upon the shaft E and has projecting from its inner side lugs orprojections L, which force the driving-wheel outwardly on its shaft forsuch purpose. This will cause the driving-shaft to rotate. In order toagain release the driving-wheel from the shaft, it will be observed fromFig. 2 that I have provided a spring P, which is interposed between thecollar J and the hub of the driving-wheel, so that it will normally tendto press the driving-wheel inward; but this can only be done when thedriving-wheelisin its rear or dotted position, so that the lugs L mayenga-ge with the notches M in the outer face of the bearing N, formed onthe lowerend of the bracket O, for the drivin g-shaft E. Upon the innerend of this shaft is mounted a disk L', Which carries a crank-pin R,havin g pivoted thereon one end of a pitman S. The other end of saidpit-man is pivoted upon a stud or pin U,

carried by the saw-carriage NV, mounted upon the guide-rods X, one ofwhich stands vertically above the other. In order to take up the wear inthe pitman-bearings, I provide bolts T and V, which bind the respectiveslotted ends of said pitman as snugly as desired upon the crank-pin andcarriage-stud.

In order to slidably mount the saw-carriage upon the guide-rods, Iemploy adjustable caps Y, which are adapted to be connected with saidcarriage by means of screws Z in such a manner that they, together withthe carriage,

form bearings which freely slide upon said guide-rods. The rods X arescrewed to brackets 2, projecting upward from the base A, by means ofscrews 3.

Near the rear end the saw-carriage is provided with a boss or extension4 in the nature of a hub. Through this boss or extension passes a bolt5, upon which, adjacent to the saw-carriage, is pivotally mounted asawframe 6 and a friction toothed segment 7 while between the saw-frameand toothed segment is mounted a packing 8, composed of leather or othersuitable material. In order to bind the friction-segment against thesawframe, I provide a chased hand-nut 9, which screws uponthe outer endof the bolt 5 and has mounted between it andthe segmentclutch Z a springand washer ll, the latter having an angular opening adapted to t uponthe angular-shaped portion 12 of the bolt 5. This spring is for thepurpose of permitting more or less yielding contact between the clutchor toothed segment` and the boss on said saw-frame, while the washerprevents the unscrewing action on the hand-nut by reason of the relativemovement between the saw-frame and clutch or toothed segment, as willhereinafter appear. It will be seen that the outer end of said bolt isalso slotted, as shown at 5. This is for the purpose of giving aspring-like effect on the hand-nut J at all times, so that it willassist in preventing the hand-nut from unscrewing. The outer end of thesaw-frame supports a saw 13, mounted in the ordinary or any suitablemanner. It will be observed that the saw-teeth all slant in onedirection, which is for the purpose of permitting them to saw when theframe is moved in the direction of their slant only. In sawing metalsome is much softer than others, and the harder the metal themorepressure is required, so that the teeth will cut faster. Heretoforethis has been accomplished by employing a heavy weight; but where suchweights were used they operated toV hold the saw in engagement with themetal when the saw-frame was making its return stroke, which acts todull the saw very quickly, as the points were being constantly groundoff on such return stroke. It has been my aim to overcome thisdifficulty and to do away with excessively heavy weights and at the sametime to provide proper mechanism for causing the saw .to be forced intoengagement on the outstroke and raised from engagement on the instroke.This Ihave accomplished by means of my friction-clutch. By means of thehand-nut 9 the toothed segment 7 may be screwed up against the packing 8and the saw-frame 6 as lightly or as snugly as desired. As the toothedsegment travels forward in engagement with the rack 14 in a mannerpresently to appear, there will be relative movement, of course, betweenthe saw-frame and the toothed segment; but since the toothed segment Aisfrictionally clutched thereto it will cause the saw-frame to pivot aboutits pivotal connection with the sawcarriage, thereby descending at itsouter end. This will of course cause the sawto be forced into engagementwith the metal, and the tighter the friction between the toothed segmentand the saw-frame the harder such engagement with the metal. As thecarriage makes its return stroke the toothed segment 7 will raise theend of the saw-frame from cutting or rubbing contact with the metalbeing operated upon, such metal being held by a vise 15, which is madeadjustable by means of the screw 16, so that it will accommodate varioussizes of metal as desired.

I have referred to the saw-carriage, together with the saw-frame, astraveling back and forth. This is accomplished by means of the pitmanbeing connected with the carriage W and to the crank-pin R, so that asthe crankdisk L is rotated the saw-carriage will be moved backward andforward in its ways or guides X.

In order to assist the saw-frame in holding the saw into cutting contactwith the metal, I provide a sliding weight 17, which is mounted on atrack 1S, extending the full length of the saw-frame. This weight may bemoved in or out on its track, according to the degree of pressuredesired, and is held in such position by a set-screw 10, adapted toscrew down upon the track. The hand-nut 9 may also be manipulated tocause a tighter gripping of the clutc/h members, which will cause thesaw ,to be forced into the metal much harder than where the hand-nut isoperated to bind the clutch members together but slightly. Howi ever, itwill be understood that the weight and the friction-clutch are operatedin conjunction with each other-that is, when the weight is slid outwardmore pressure or ten stroke, while when the weight is thrownbackl wardon the sawframe the tension of the clutch members may be lessenedaccordingly.

In order to hold the saw-frame thrown back to more readily permit ofplacing the metal to be operated upon within the vise, I provide aslotted lever 18, which has a notch 19 at its upper end, into whichextends a screw 20. This screw is adaptedl to be carried by thesaw-frame, while the lever itself is supported upon a projection 21,extending from the sawcarriage. As the saw-frame is raised to theposition indicated in dotted lines in Fig. 1 the stud-screw 20 engageswith the notch 19', and thereby holds the saw-frame inV its elevatedposition. Vhen itis desired to operate the machine, the slotted lever1S' is thrown to the position indicated in full lines in Fig. 1, inwhich position the saw-frame is permitted to drop into contact with themetal to be operated upon.

I will now refer to the means for automatically stopping the operationof the machine when it has entirely severed the metal it is operatingupon.

IOO

IIO

ISO

It will be seen that from the side of the sawcarriage extends a bracket2l'. In the upper end of the bracket is carried a set-screw 2:2. Uponthe top of the set-screw rests the sawframe when in its lower position.In this position the hook 23 will engage with the lug 2t', projectingfrom the lever K. Thus as the saw-carriage is again moved to its rearmost position the lever K is partially rotated, which will cause theteeth L to match with the notches M on the bearing N, so that the springmay force the driving-wheel along on the shaft E until the tooth orprojection II disengages with the tooth or projection I on the collar J,whereby the driving-pulley is disconnected from the main driving-shaft,thus stopping the operationof the machine. It will be understood, ofcourse, that until the saw-frame comes in contact with the set-screw 22the hook 23 will not be sufficiently close to the lug 24' to engagetherewith. Consequently the machine will continue to operate as long asthere is any metal to be sawed, as the sawframe will not rest upon theset-screw until after the metal is severed.

Referring now to the means for holding the saw-frame from unduevibrations at its outer end, it will be seen that the bracket 25,forming a portion of the saw-frame, carries a slotted bolt 2G, which ismounted in a slightlyelongated hole 27 in said bracket. This slottedbolt engages with one edge of the bracket 2l' and the elongated hole 27permits of slightly adjusting the bolt so that there will be no bindingbetween it and the bracket. In this manner the sawframe is preventedfrom laterally vibrating because of its connection with the bracket 2lso far in advance of its pivotal connection with the saw carriage. Thusthe saw will run perfectly true through the metal and will make a smoothand even cut.

Referring to Fig. 3, it will be seen that the bolt 5 is held fromturning in the saw'carriage by reason of a set-screw 2', which isscrewed into the hub 4 and against the bolt.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, ism

l. In a hacksaw, the combination with a base, of a reciprocatingsaw-carriage mounted thereon, a saw-frame pivotally connected with saidsaw-carriage, means for throwing said saw-frame downward at its forwardend when traveling in one direction and upward when traveling in theopposite direction.

2. In a hacksaw, the combination with a base, of a reciprocatingcarriage mounted thereon, a saw-frame carrying a saw pivotally connectedwith said carriage, a friction-clutch adapted to engage with saidcarriage and with said sawframe, and means for reciprocating saidcarriage and operating said clutch members relatively to each other.

3. In a hacksaw, the combination with a base, of a sawcarriage slidinglymounted thereon, a saw-frame pivotally connected at one end with saidcarriage and carrying at its other end a saw, a toothed segment alsomounted on said pivot and adapted to frictionally contact with saidsaw-frame, a rack carried by said base and adapted to be engaged by saidtoothed segment, means for rolling said toothed segment backward andforward on said rack and also for reciprocating said carriage, wherebythe saw is forced into cutting engagement as the toothed segment rollsin one direction, and out of such cutting engagement when-such segmentrolls in the opposite direction, substantially as shown and described.

4. In a hacksaw, the combination with a base, of a main driving-shaftcarried by said base, a driving-wheel loosely mounted upon said shaftand a crank-disk ixedly mounted thereon,a slidable saw-carriage mountedupon said base, a pitman pivoted at one end to said saw-carriage and atits other end to said crank-disk, a saw-frame also pivoted to saidcarriage and carrying at its outer end asaw, a rack mounted on saidbase, a toothed segment engaging with said rack, and adjustable frictioncontact between said toothed segment and said saw-frame whereby when thetoothed segment is rolled forward on said rack the segment will act tothrow the for-V ward end of said frame downwal'd so that said saw willmore readily engage with the metalto be operated upon, and on its returnstroke will throw said saw out of engagement with the metal operatedupon, substantially as shown and described.

5. In a hacksaw, the combination with a base, supporting a maindriving-shaf t, a driving-pulley loosely mounted thereon, and carrying atooth or projection extendingfrom its hub, a cap also having a matchingtooth or projection xedly mounted on said shaft, said lugs adapted toengage with each other, whereby said shaft is rotated, a crank-diskcarrying a crank-pin lixedly mounted on the inner end of said shaft, asliding saw-carriage mounted in ways or guides carried by said bed, asaw-frame pivotally connected, at one end, with said carriage, andcarrying a saw at its other end, a toothed segment rotatably mounted, arack secured to said base with which the segment engages, means forfrictionally connecting said segment with said saw-frame, and a pitmanfor connecting said saw carriage and said disk crank-pin` together,whereby when the main driving-shaft IOO IIO

of-said friction-clutch whereby there will be relative movement betweensaid member of the clutch and said saw-frame, substantially as shown anddescribed.

7. In a hacksaw, the combination with a base, having a saw-carriagereciprocatingly mounted thereon, of a saw=frame pivotally connected withsaid carriage, a toothed segment rotatably mounted upon said pivot andadapted to engage with the base of said machine, a frictional surfacebetween said saw'- frame and said toothed segment, a hand-nut adapted topress said toothed segment, frictional surface and saw-frame into closecontact with each other; and awasher and spring interposed between saidtoothed segmentand said hand-nut, and means to prevent said washer fromrotating, and other means for reciprocating said carriage, substantiallyas shown? and described.l

8. In ahacksaw, the combination with a base havin ga reciprocatingcarriage mounted thereon, of a saw-frame pivoted to said carriage, aslotted lever also pivoted to said carriage and having a notch in saidslot, a stud or pin projecting from saidsaW-frame and adapted to extendwithin the slot in said lcver and to engage said notch when the saw;frame is in its-raised position.

9. In a hacks'aw, the combination with a base having a reciprocatingcarriage mounted thereon, of a saw-frame pivotally connected tosaidVcarriage, a hook carried by said sawframe, means for throwing saidlmachine out of operation, such means adapted to be engaged by said hookand to automatically stop thefmachine when said saw-carriage is in theproper position to permit of such engagement, substantially as shown anddescribed.

10. In a hacksaw, the combination with a base carrying a maindriving-shaft and having mounted thereon a reciprocating carriage, apulley outwardly shiftable on said shaft, means for engaging saiddriving-pulley when in its outer limit to drive said shaft, a leveradapted to be operated in one direction to throw said pulley to itsouter position, and a spring adapted to shift said pulley out of drivingcontact with said shaft, a sawframe pivotally connected with saidcarriage and carrying a hook adapted to engage with said lever to throwit in the opposite direction when the saw-frame is in its lowermostposition, whereby the spring will shift the driving-pulley out ofdriving contact with said shaft.

l1. In a hacksaw, the combination With'a base, of a reciprocatingsaw-carriage mounted thereon, a bracket extending from said earriage andcarrying a set-screw, a saw-frame pivoted to said carriage and adaptedto be limited in its downward movement by said set-screw, substantiallyas shown and described.

12. In a hacksaw, the combination with a base carrying a reciprocatingand pivotallymounted saw-fram e, of a track or slide formed upontheupper edge of said frame, a weight adapted to slide on said track andaset-screw for securing said weight in any desired p0- sition upon saidtrack, substantially as shown and described.

In testimony whereof I aiiix my signature in presence ot' two witnesses.

EDWARD E. EUCHENHOFER.

W'itnesses:

PAUL J. VORTMAN, E. J. FINKE.

